Cooper Bussmann LPJ-45SP Class J Time Delay Fuse 45A

Product Description

The COOPER BUSSMANN LPJ-45SP is a Class J time delay cartridge fuse rated at 45 amps. It is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element, time delay construction allows it to tolerate brief inrush currents — common during motor starts and transformer energization — without nuisance tripping, while still responding quickly to sustained fault conditions. The fuse measures 2.375 inches in length and 27 millimeters in diameter, fitting standard Class J fuse holders. It carries a 300 kA interrupting rating at AC (RMS) and 100 kA at DC, providing robust short-circuit protection in demanding applications.

The LPJ-45SP is suited for residential, commercial, and light industrial electrical panels, motor control centers, and disconnect switches where Class J fusing is specified. Licensed electricians install this fuse in systems requiring high-interrupting-capacity overcurrent protection. It is commonly used in branch circuit and feeder applications where motor loads require time delay characteristics to prevent false tripping on startup inrush.

Key Features

• 45-amp Class J time delay rating for motor and transformer circuit protection
• 300 kA interrupting rating at AC (RMS) for high-fault-current environments
• 100 kA interrupting rating at DC
• Dual-element design tolerates inrush currents without nuisance tripping
• Non-indicating cartridge body; mounts in standard Class J fuse holders
• UL Listed, CSA Certified, CE Certified, and RoHS Compliant

Compatibility

Designed for use in standard Class J fuse holders rated for 45-amp, 600-volt service. Consult fuse holder manufacturer specifications to confirm dimensional and electrical compatibility before installation.

Installation Notes

Installation and replacement of this fuse should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before removing or installing a fuse. Use an appropriately rated fuse puller when servicing fuses in live panel environments. Verify that the replacement fuse class, amperage, and voltage rating match the circuit requirements before energizing.